Yeah it was pretty fucking awful. In general, no need to hit the panic button but there are a few things to be concerned about:
1. Sean Smith is done after this season. He can't even cover tight ends. Unfortunately, the Raiders are stuck with him until they can get Obi back from IR.
2. David Amerson is in a bad way right now. I don't if it's focus or something else but he's allowed 3 TDs in last two games and the one he allowed tonight was embarrassing. He was in perfect position for the INT and he let that WR take that ball away from him.
3. Bruce irvin is doing well with run defense and dropping back into coverage but his pressure on the QB is just not there like it was last year. He doesn't have a sack through 3 games and I can't recall him getting close to doing so.